EP0198740A1 - Anschlagkeil für den Ventilsteuerkolben eines Bremskraftverstärkers und Bremskraftverstärker mit einem solchen Keil - Google Patents

Anschlagkeil für den Ventilsteuerkolben eines Bremskraftverstärkers und Bremskraftverstärker mit einem solchen Keil Download PDF

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Publication number
EP0198740A1
EP0198740A1 EP86400583A EP86400583A EP0198740A1 EP 0198740 A1 EP0198740 A1 EP 0198740A1 EP 86400583 A EP86400583 A EP 86400583A EP 86400583 A EP86400583 A EP 86400583A EP 0198740 A1 EP0198740 A1 EP 0198740A1
Authority
EP
European Patent Office
Prior art keywords
key
groove
radial
body part
plunger
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP86400583A
Other languages
English (en)
French (fr)
Other versions
EP0198740B1 (de
Inventor
Henry Pagot
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bendix France SA
Original Assignee
Bendix France SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bendix France SA filed Critical Bendix France SA
Publication of EP0198740A1 publication Critical patent/EP0198740A1/de
Application granted granted Critical
Publication of EP0198740B1 publication Critical patent/EP0198740B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
    • B60T13/46—Vacuum systems
    • B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
    • B60T13/57—Vacuum systems indirect, i.e. vacuum booster units characterised by constructional features of control valves

Definitions

  • the present invention relates to the abutment keys for the distribution valve plunger of a brake booster, typically of the vacuum type, the key being intended to be received in a radial groove of a hub part of a piston.
  • servomotor assistance the key being of the type formed from a metal plate and comprising a body part extended by an end part having a transverse width less than the transverse width of the groove and formed with a cutout constituting two end arms, and means for retaining on the body part intended to cooperate with at least one adjacent wall of the radial groove.
  • a constant concern with this type of stop key is to prevent the key from being able to come out of the hub groove, in particular under the effect of the significant vibrations to which this type of automotive material is subjected.
  • the key has folded side edges engaged slightly by force in the radial groove, which is further provided, in its front end face, with a retaining projection intended to be housed in a central opening of the body part of the key.
  • Document DE-A-31 13 271 describes, moreover, a key passing through openings of small thickness of the peripheral wall of the hub part and of a concentric ferrule secured to the assistance piston, the key comprising lateral recesses in its outer part intended to cooperate with projections facing the opening of the hub part.
  • the object of the present invention is to provide a stop key of simple and robust design, requiring no particular conformation of the hub part and ensuring a retaining effect by self-locking of the key in the groove of the hub part.
  • the body part of the stop key comprises two elastic tabs extending laterally and angularly in the direction opposite to the end part forming the end arms and each terminated by an angle v i f, the transverse distance, at rest, between the sharp angles being greater than the transverse width of the groove of the hub part.
  • the flexible tabs are erased by contracting transversely to slide along the walls transversely opposite the groove until the key adopts its final mounting position. In this position, the sharp angles of the flexible legs are in incisive abutment against the side walls facing the groove into which they penetrate slightly. If the key tends to come out of the groove, this results in an arching of the flexible tabs tending to spread them apart and bite more deeply into the walls of the groove, thus guaranteeing the maintenance of the key in the latter.
  • this groove has, in line with the stop key, a substantially constant transverse width over its entire radial extension.
  • the groove of the hub part comprises an inner radial abutment surface for at least one of the end arms of the key.
  • FIG. 1 the central part of a hub 1, typically made of a plastic material such as bakelite, of an assistance piston of an assistance booster which we recognize a portion of the rear shell of housing 2.
  • a three-way distribution valve means 3 associated with a valve plunger 4 integral with the input rod 5 of the booster and capable of cooperating with a reaction disc 6 mounted in an end cup of an output rod 7 of the booster, typically intended to be coupled to a piston of a master cylinder associated with the booster.
  • the plunger 4 slides axially in a central bore 8 of the hub 1 and comprises an annular peripheral groove 9 defining an annular bearing face 10 directed towards the input rod and intended to cooperate in bearing with a stop key, generally designated by the reference 11, mounted in a radial groove 12 of the hub 1. More specifically, as can be seen better in FIG.
  • the groove 12 is delimited axially, on the side of the outlet rod 7, by a planar axial front wall 13 and is defined, in the vicinity of this front wall 13 and at least in the vicinity of the bore 8, by two parallel radial grooves facing each other 14, the groove 12 comprising a central portion 15 of axial extension greater than the axial extension of the grooves 14 and delimited by a second axial wall 16 to form a fluid access passage by means of valve 3.
  • the transverse width d, of the groove 12 is, at least in the vicinity of the wall frontal 13, sensitive constant over its entire radial extension, typically greater than the diameter of the bore 8, thus forming, substantially at the level of a diametrical plane of this bore 8, internal radial abutment surfaces 17 for the abutment key 11, as shown will see further.
  • the stop key 11 has a completely flat configuration and is produced by cutting from a metal plate with a thickness of about 1.5 mm, for example from treated steel.
  • the key 11 comprises a body part 18 terminated by an end part 19 formed centrally with a semi-circular cutout 20 of diameter greater than the internal diameter of the groove 9, so as to thus constitute two end arms 21, cooperating with the annular bearing face 10 of the plunger 4.
  • the transverse width d 2 of the end part 19 is less than the transverse width d, of the groove 12.
  • the body part 18 of the key 11 is formed, by cutting the material constituting the key, with two flexible tabs 22 extending symmetrically laterally and angularly in the direction opposite to the part of end 19 from connection zones 23 with a central zone of the body part 18 having a reduced section providing the legs 22 with the flexibility required in the plane of the key.
  • the legs 22 each terminate, opposite the end part 19, by a sharp angle 24, the transverse distance d, between these sharp angles being, at rest, greater, for example from 1 to 2 mm, than the transverse width d, of the radial groove 12.
  • the key 11 is engaged in the groove 12, substantially without axial play between the end portion 19 and the grooves 14, until the ends of the arms 21 come to bear against the abutment surfaces radial 17, flexible legs 24 sliding are ant, in the contracted state, against the walls facing the groove 12.
  • the sharp angles 24 of the legs 22 bear incisively against the transverse walls of the groove 12 to ensure the aforementioned "harpoon" retention effect.
  • the body part 18 (with the exception of the tabs 22) has a massive configuration with a transverse width substantially equal to the width d 2 of the end part 19. It is however possible providing, in the central portion of upper axial extension 15 of the groove 12, a projecting part 25 extending axially from the second axial front wall 16 towards the first axial front wall 13 as far as the immediate vicinity of the key 11. In these conditions, the body part 18 of the key 11 may have a reduced width as shown in FIG. 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Braking Systems And Boosters (AREA)
EP86400583A 1985-03-27 1986-03-19 Anschlagkeil für den Ventilsteuerkolben eines Bremskraftverstärkers und Bremskraftverstärker mit einem solchen Keil Expired EP0198740B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8504555 1985-03-27
FR8504555A FR2579541B1 (fr) 1985-03-27 1985-03-27 Cle butee pour plongeur de valve d'un servomoteur d'assistance au freinage, et servomoteur equipe d'une telle cle

Publications (2)

Publication Number Publication Date
EP0198740A1 true EP0198740A1 (de) 1986-10-22
EP0198740B1 EP0198740B1 (de) 1988-08-31

Family

ID=9317626

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86400583A Expired EP0198740B1 (de) 1985-03-27 1986-03-19 Anschlagkeil für den Ventilsteuerkolben eines Bremskraftverstärkers und Bremskraftverstärker mit einem solchen Keil

Country Status (6)

Country Link
US (1) US4672882A (de)
EP (1) EP0198740B1 (de)
JP (1) JPS61226354A (de)
DE (1) DE3660616D1 (de)
ES (1) ES297061Y (de)
FR (1) FR2579541B1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3688647A (en) * 1970-12-21 1972-09-05 Bendix Corp Clip retainer
DE3113271A1 (de) 1981-04-02 1982-10-21 Alfred Teves Gmbh, 6000 Frankfurt Mechanisch gesteuerter kraftverstaerker, insbesondere fuer bremsanlagen von kraftfahrzeugen
EP0101658A1 (de) 1982-08-20 1984-02-29 BENDIX France Bremskraftverstärker mit Halteelement für den Ventilsteuerkolben
FR2551710A1 (fr) * 1983-09-09 1985-03-15 Teves Gmbh Alfred Amplificateur de force de freinage actionne par depression

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3312147A (en) * 1966-03-07 1967-04-04 Bendix Corp Fluid pressure servomotor
US4512237A (en) * 1982-01-16 1985-04-23 Jidosha Kiki Co., Ltd. Tandem type brake power servo booster
JPS60108582U (ja) * 1983-12-28 1985-07-23 自動車機器株式会社 ブレ−キ倍力装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3688647A (en) * 1970-12-21 1972-09-05 Bendix Corp Clip retainer
DE3113271A1 (de) 1981-04-02 1982-10-21 Alfred Teves Gmbh, 6000 Frankfurt Mechanisch gesteuerter kraftverstaerker, insbesondere fuer bremsanlagen von kraftfahrzeugen
EP0101658A1 (de) 1982-08-20 1984-02-29 BENDIX France Bremskraftverstärker mit Halteelement für den Ventilsteuerkolben
FR2551710A1 (fr) * 1983-09-09 1985-03-15 Teves Gmbh Alfred Amplificateur de force de freinage actionne par depression

Also Published As

Publication number Publication date
ES297061Y (es) 1989-06-16
FR2579541B1 (fr) 1990-06-29
ES297061U (es) 1988-12-16
EP0198740B1 (de) 1988-08-31
DE3660616D1 (en) 1988-10-06
US4672882A (en) 1987-06-16
FR2579541A1 (fr) 1986-10-03
JPS61226354A (ja) 1986-10-08

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